Paul: "I think Susan B. Anthony might be a good choice." Huckabee: "That's an easy one I'd put my wife on there." Rubio: "Rosa Parks." Cruz; "I wouldn't change the $10 bill, I'd change the $20...I'd leave Alexander Hamilton right where he is...I very much agree with Marco that it should be Rosa Parks." Carson: "I'd put my mother on there." Trump: "I think my daughter Ivanka...other than that we'll go with Rosa Parks." Bush: "I would go with Ronald Reagan's partner, Margaret Thatcher." Walker: "I'd put Clara Barton. I once worked for the American Red Cross."

Fiorina: "I wouldn't change the $10 bill or the $20 bill, I think honestly it's a gesture, I don't think it helps to change our history. What I would think is that we ought to recognize that women are not a special interest group, women are the majority of this nation, we are half the potential of this nation and this nation will be better off when every woman has the opportunity to live the life she choses." Kasich: "It's probably not maybe legal but I would pick Mother Theresa."

Christie: "I think the Adams family has been shorted in the currency business, our country wouldn't be here without John Adams and he wouldn't be able to do it without Abigail Adams."

10:50 p.m. Tapper brings up the fact that Trump has linked

vaccines to autism and asks Carson, a pediatric neurosurgeon, to weigh in on

whether he should stop saying that.

"There have been numerous studies and they have not demonstrated that there's

any correlation between vaccinations and autism. This is something that was

spread widely 15 or 20 years ago and it has not been adequately revealed to the

public what's actually going on," he said. But, he said, there are some

vaccinations which don't prevent diseases that would kill people and said there

should probably be some discretion. He blamed the concerns about vaccines on the

fact that they are supported by "big government."

As to whether Trump should stop making the link, he said he can read more and

will make an intelligent decision.

Trump said, "I am totally in favor of vaccines" but said they should be

spaced farther apart and given in smaller doses. He cited the case of an

employee whose child got vaccines and then two weeks later got a fever and then

autism.

Asked to respond, Carson said, "He's an okay doctor," -- a riff on the criticism

that Trump fired his way.

"The fact of thematter is we have extremely well-documented proof that

there's no autism associated with vaccinations but it is true that we are

probably giving way too many in way too short period of time," he said, saying

he would support cutting down on the number and frequency of vaccinations.

Paul, the other doctor on stage, was also asked to respond.

"I'm all for vaccines but I'm also for freedom. I'm also a little concerned

about how they're all bunched up," he said.

2015 Republican debate: GOP candidates on marijuana

Sen. Rand Paul defends marijuana legalization, Jeb Bush admits he

smoked pot when he was younger, and others weigh in

10:35 p.m. The candidates spent several minutes discussing

the issue of marijuana legalization by states, and Paul repeated his position

that enforcement of drug laws has produced uneven outcomes among white and black

Americans.

Christie said that New Jersey has medical marijuana laws, but "I am against

the recreational use of marijuana." He spoke about another policy in New Jersey,

which is that nonviolent, non-dealing drug users go to mandatory treatment

rather than jail for the first offense.

"I'm pro life, and I think you ned to be pro life for more than just the

womb," he said. But he said that victims of recreational marijuana include

employers (who suffer from lost productivity) and people's families.

Fiorina weighed in with an emotional story about her daughter's death from

drug addiction.

"We are misleading young people when we tell them that marijuana is just like

having a beer. Its not," she said. She added, "The marijuana kids are smoking

today is not like the marijuana that Jeb Bush smoked 40 years ago."

She called for criminal justice reform as well.

10:34 p.m. Bush tweets an apology too:

10:30 p.m. A confession from Bush as the discussion turns to

marijuana legalization: "Forty years ago I smoked marijuana and I admit it, I'm

sure other people might have done it and don't want to admit it...my mom's not

happy that I just did."

10:18 p.m. Though Bush has defended his brother through much

of the debate, he sought some daylight on the issue of 43's nomination of John

Roberts to the Supreme Court.

"John Roberts has made some really good decisions for sure but he did not

have a proven extensive record that would have made clarity the important thing.

And that's what we need to do," he said. Later, he added, "I think he is doing a

good job, but the simple fact is going forward what we need to do is to have

someone that has a longstanding set of rulings that consistently makes it clear

that he is focused exclusively on upholding the constitution of the United

States, that they won't try to use the bench as a means by which to legislate."

Cruz said Roberts' nomination was a "mistake" and that he changed the law to

uphold Obamacare. Bush pointed out that he had supported Roberts' nomination.

"That was a mistake and I regret that," he said. He said Bush nominated

Roberts because it was politically expedient.

10:10 p.m. After Jake Tapper brings up Carson's statement

that the U.S. would not have gone to war in Afghanistan if he had been

president, Christie said that's not what he would have done and told the story

of worrying about his wife on 9/11 because she worked two blocks from the World

Trade Center.

"We lost friends htat day, we went to the funerals, and I will tell you that

what those people wanted and what they deserved was for America to answer back

against what had been done to them and I support what President Bush did at the

time."

Carson said that instead of war, Bush could have used the bully pulpit to

"galvanize everybody behind a national goal" the way former President John F.

Kennedy did during the space race.

"While that might have been a fine idea that Dr. Carson had, these people

were about to kill us," he said.

Rubio chimed in as well.

"Radical terrorism cannot be solved by intellect," he said.

10:04 p.m. Defending former President George W. Bush was a

popular position for the audience in the Reagan Library Wednesday night. Trump

went after the 43rd president when arguing with Bush over foreign policy,

saying, "Your brother and your brother's administration gave us Barack Obama. It

was such a disaster those last few months Abraham Lincoln couldn't' have been